Remove more trailing whitespace

Author: cacheflow

spec/fcm_spec.rb

@@ -81,7 +81,7 @@
       temp_file.write(json_credentials)
       fcm_with_temp_file = FCM.new(temp_file)
 
-      expect do 
+      expect do
         fcm_with_temp_file
       end.not_to raise_error
       temp_file.close